The sound range of the eight-hole Xun is too narrow. Is there any new fingering method to improve it?

The traditional fingering is from bass 5 to alto 6, which is the same as the range of Hulusi. Xi'an's fingering is from bass 5 to treble 1. There are also 10-hole ones that can reach treble 2, and there are also special 10-hole ones. You can play the high note 3.

There is a fingering chart here, you can take a look at it, but the fingerings cannot be used randomly. If you think the range is too narrow, you can only practice your pitch blowing skills or change the xun.